Expansion relief-pump.



A. A. BowsER, EXPANSION RELIEF PUMP.

APPLICATION FILED SEPT- 22| 1913.

Patented July 27, 1915.

2 SHEETS-SHEET I.

IIIIIII 14m I I I B M u L o c A. A.l BOWSER. EXPANSION RELIEFVPUIVIP.

, APPLICATIQN FILED SEPT. 22 1913. 1,147,841. Patented July 27, 1915.

2 SHEETS-SHEET 2.

COLUMBIA PLANUGRAPM co,.wAsmNd1oN. D. C.

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EXPANSION RELIEF-PUMP.

Specification of Letters Patent.

Patent-ea .nay et, ieia.

Application iled September 22,1913. Serial No. 791,011.

T0 all whom it may concern.'

Be it known that I, ALLENA. Bowser, a citizen of the United States, residing at Fort Wayne, in the county vof Allen and State of indiana, have invented certain new and useful Improvements in Expansion Relief-Pumps, of which the following is a specification.

My invention relates to expansion relief pumps and has for its primary object the provision of an improved expansion relief pump which shall have means for pro-tecting the pumping chamber of the pump from the effects of expansion of fluid held therein.

Vith the above and other objects in view this invention consists substantially in the combination, construction and arrangement of parts all as hereinafter described, shown in the accompanying drawings, which form a part of this specification and vshow the preferred embodiment of my invention, and more specifically set forth in the subjoined claims.

1n the drawings: Figure 1 is a side elevation of a pump embodying my invention, a portion of the pump being broken away. Fig. 2 is a vertical section of the pump shown in Fig. 1 and on the line 2-2 of Fig. 3 looking in the direction indicated by the arrows. Fig. 3 is a horizontal section of the pump shown in Fig.` 1 taken on the line 3 3 of Fig. 2 and looking in the direction indicated by the arrows. Fig. f1- is an enlarged horizontal section of a valved vent forming part of my invention and is taken onthe line of Fig. 2 looking in the direction indicated by the arrows. Fig. 5 is a vertical section of a double valve used for maintaining a column of liquid in the pump.

When the contents of the pumping chamber of a pump are heated, while the pump is `not operated, the expansion-of the contents frequently bursts the pumping chamber or causes other damage. It is one of the objects of this invention to protect pumps from damage from such a source.

In the drawings refer-ence numeral 10 indicates the pumping chamber of a pump, the upper casing of the pump being shown at 11 and the lower casing at 12. Y

At 13 (see Fig. 2) is shown a piston mounted for reciprocat-ion in the chamber 10 and provided with an upwardly opening valve 14. A stud 15 formed upon the lower casing 12 projects upwardly within the chamber 10 and, when the piston 13 is at the bottom of its stroke, contacts with the valve 11 raising it very slightly from its seat in the piston. A small space 16 is provided between the bottom of the piston and the upper surface of the lower casing 12. Communicating with the space 16 is a vent 17 formed partly in the lower casing 12 and partly in pipes 18 and 19. The pipe 18 is preferably round and contains a square longitudinal valve member 2O pointed at its lower end for contact with a valve seat 2l provided in the vent 17. The weight of the valve member 20 is suiiicient vto maintain a column of liquid within the chamber 10 and to the upper or discharge end thereof. Sufficient space, however, is provided in the pipe 18 for a slight vertical movement of the valve member 20. The piston rod 22 attached to the piston 13 reciprocates the piston within thechamber 10. The intake of the pump is indicated at 23 and the outlet or discharge at 24.

1n the type of pump shown, the column of liquid is maintained within the pump to the height of the discharge 21, and in order to maintain this column of liquid I preferably employ a double footvalve 25,

shown in Fig. 5, although any other con-A venient means may be employed. Power is applied to the pump in any suitable manner, such, for instance, as the handled crank 26 (see Fig. 1) which operates a reciprocating rack 27 attached, by means of a yoke 28 to the piston rod 1n the operation of my invention the upward movement of the piston 13 throws a discharge of liquid from the outlet 24.- and at the same time draws a fresh supply through the intake 23. The chamber 10 is constantly filled with liquid. During the downward passage or reciprocation of the piston 13 the valve 1l rises slightly from its seat in the piston allowing the piston to pass through the liquid contained in the lchamber 10 to its lowermost position. When it has reached this lowermost position the pump has completed a full stroke, and the contact of the valve 14: with the stud 15 holds the valve in the piston open very slightly, which allows liquid communication between the interior of the chamber 10 above the piston and vent 17. While the piston is in this lowermost position the near presence of heat may cause an expansion of the liquid contents of the pump. rifhis eX- pansion forces the liquid past the valve 14 loo' into the space 16 and vent 17, slightly raising the valve member 2O from its seat 21 and allowing superfluous fluid to escape through the pipes 18 and 19. The segmental spaces between the inner surface of the pipe 1S and the outer surface of the valve memberl 20 admit of the passage of liquid around the valve member to the pipe 19. It will be seen, by reference to Fig. l, that the pipe 19 extends upwardly to a point adjacent the top of the upper casing 11 of the pump. Under normal pumping conditions the valve member 20, being of suiiicient weight to counterbalance the column of liquid in the pump, is not raised from its seat, but under the increased pressure within the pump, due to the expansion of liquid, the valve member 2O will rise from its seat and relieve the chamber of the pump which otherwise would burst.

In the accompanying drawings and in the foregoing description is set forth the preferred embodiment of my invention, but it is obvious that one skilled in the art may make modifications thereof without departing from the spirit of the invention.

I claim:

l. The combination with a pump having a cylinder with an intake, an outlet and a valved piston, of means for opening the piston valve at one end of the stroke, and means connected to the pump between the piston and the intake for relieving excess pressure due to the expansion of fluid within the pump when the pump is idle and when both the intake and the outlet are positively closed.

2. Thecombination with a valved piston pump having a cylinder with an intake and an outlet, of a projection at one end of the pump to engage and open the piston valve at one end of the piston stroke, and a valved vent in communication with the pump cylinder at a point between the intake and the piston when it is at the end of the stroke and in contact with the said projection for relieving excess pressure due to the expansion of fluid within the pump when both the intake and the outlet are positively closed.

3. The combination with a valved piston pump having an intake and an outlet, of a valved vent in communication with the pump between the piston and the intake, and means in connection with the pump to open the piston valve at one end of the stroke to open the pump on both sides of the piston to communication with the vent,

whereby excess pressure may be relieved therefrom when the pump is idle and both the inlet and the outlet are closed.

4i. The combination of a single acting piston pump having an intake in its base and an outlet in its top, an upwardly opening valve within the pump piston, a stud protruding upwardly from the base of the pump and contacting with the piston valve at the limit of the intake stroke of the pist0n -to open it, a vent communicating with the piston chamber of the pump upon the intake side of the piston, a valve seat within the vent, and a valve member engaging the s` valve seat to maintain the vent normally closed and movable within the vent to relieve excess pressure within the pump.

5. The combination of a single acting piston pump having an intake in its base and an outlet in its top, an upwardly opening valve within the pinnp piston, a stud protruding upwardly from the base of the pump and contacting with the piston valve at the limit of the intake stroke of the piston to open it, a vent communicating with the piston chamber of the vpump upon the intake side of the piston, a valve seat within the vent, and a valve member engaging the valve seat to maintain the vent normally closed and movable within the vent to relieve excess pressure within the pump, said vent valve member being shaped to permit the passage of fluid outwardly from the pump chamber when removed from the valve seat.

6. The combination of a single acting piston pump, a valve in the pump piston, an intake for the pump adjacent the bottom thereof, a discharge for the pump adjacent the top thereof, a ventcommunicating with the interior of the pump upon the intake side of the piston and extending upwardly to a point adjacent the discharge of the pump, a valve operating within the vent to control the passage of liquid therethrough,

and means for opening the valve of-the pump piston when the piston is at the bottom of its stroke.

ln testimony whereof I have signed my name to this specification, in the presence of two subscribing witnesses, on this 16th day` of September A. D. 1913.

ALLEN A'. BOWSER.

l/Vitnesses:

J. R. MATLACK, L. W. THOMAS.

Copies of this patent may be obtained for ive cents each, by addressing the Commissioner of Patents. Washington, D. C. 

